BSE Sensex and Nifty 50 declined on Tuesday as a sharp rise in crude oil prices, driven by Middle East tensions, weighed on investors' sentiment. In early trade, the Sensex was down 611.87 points at 77,004.53, while the Nifty declined 169.15 points to 24,041.85. Asian markets also weakened, with Japan's Nikkei 225 dropping 1.17% and South Korea's KOSPI falling 2.01%.